Half-wave oxidation potentials

TABLE 23. Half-wave oxidation potentials (vs SCE), separation of peak potentials and Fe-Fe distances in compounds 17a and 17b200... 

Rauhut and coworkers proposed the occurrence of a charge transfer complex between the HEI and the ACT in order to explain the electronically excited-state generation in the peroxyoxalate system. Chemiluminescence quantum yield (4>cl) measurements with different activators have shown that the lower the ACT half-wave oxidation potential (Ei/2° ) or singlet energy (Es), the higher the electronically excited-state formation rate and 4>cl- According to the mechanistic proposal of Schuster and coworkers for the CIEEL... 

A simple one-electron oxidation process appears to be excluded by the lack of a correlation between the observed reactivities and the half-wave oxidation potentials of the olefins from the literature. What is the role of the sacrificial aldehyde The answer to this question is a good entry point into the mechanism of the transformation. We... 

Tab.4 Half-wave oxidation potentials and HOMO-LUMO gaps in solution (in V vs. Fc/Fc ) of Cgo and C70 using various solvents, supporting electrolytes, and temperatures...

Tab. 9 Half-wave oxidation potentials (in V vs. Fc/Fc+) and HOMO-LUMO gap in solution of the higherfullerenes...

Most aquatic oxidation reactions are attributable to well-defined chemical oxidants. As a result, model systems can be designed where second-order rate constants can be determined precisely for families of organic congeners. The comparatively high quality of these data allows mechanistic models of electron transfer to describe aquatic oxidations of environmental interest. Kinetic studies of these processes have produced many QSARs, mostly simple empirical correlations with common convenient descriptors such as the Hammett constant (a), half-wave oxidation potential ( j/2)> energies of the highest occupied molecular orbital ( HOMO), or rate constants for other oxidation reactions as descriptors (Canonica and Tratnyek, 2003). Their predictive power has lead to engineering applications in water treatment and remediation. 

Half-wave Oxidation Potentials of Some Aromatic Compounds in SSEs Containing Lewis Acids"... 

Table 1. Rate constants (k ) for quenching of donor excited states by vinyl monomers and half wave oxidation potentials of donor (E° /2)...

Table 3 Half-wave oxidation potentials obtained by oyolie voltammetry (vs. Ag/AgCI in benzonitrile) <1995JMC1539, 2001HAC287>...

Table 2 Half-Wave Oxidation Potentials (in V vs/ Fc/Fc" ") of 50 Using Various Solvents, Supporting Electrolytes, and Temperatures...

Coinitiators according to route A are electron-deficient materials. Representative examples are onium compounds and triazines [269, 563], The free energy of photoinduced electron transfer (AGei) between a photosensitizer and a coinitiator is described by Eq. (64), in which /i, /2 is the half-wave oxidation potential (route A e J2 is representative for the sensitizer route B Fox" stands for the coinitiator), is the half-wave reduction potential (route A red is representative for the coinitiator route B stands for the sensitizer), and oo is the... 

Table 1 Half-wave oxidation potentials of peri-chalcogen donors ...

Comprehensive reviews covering the electrochemical data for selenium- and tellurium-based tetrachalcogenafulvalenes have appeared, as mentioned in the introduction <87SR155,93SR245). Table 2 gives the half-wave oxidation potentials for selected representative examples of the selenium- and tellurium-based donors. 

Table 2 Half-wave oxidation potentials for selected tetrachalcogenafulvalenes.

Further papers in this section report intramolecular hydrogen-bonding in 2-arylaminomethylenecycloalkanones (menthone, carvomenthone, camphor)," the effect of chlorinated solvents on the stability constants of hydrogen-bonded complexes between pyrrole and, inter alia, fenchone,and a correlation of half-wave oxidation potentials with the pK values of the corresponding conjugate acids e.g. 3-endo-cyanocamphor). ... 

Half-wave oxidation potentials (E1/2) in MeCN at a platinum electrode, and gas-phase ionization potentials (P) were measured for 15 indoles and 12 indolizines substituted at the 5-membered ring. Except for a few compounds, a linear correlation of , 2 and P was found. Deviations of linearity were discussed in terms of conformation differences between the two phases <86JCS(P2)1229>. 

FIGURE 4.9. Plot of half-wave oxidation potentials vs. ionization potentials for aromatic hydrocarbons. The electrochemical potentials are from Ref. 5 and the ionization potentials from Ref 6. 

Less detailed information can be obtained by determination of polarographic half-wave oxidation potentials. Thus electron-withdrawing substituents increase the ionization potential of norbomadienes and, as expected in view of the linear relationship between E. and I.P., increase the E. values. In Table 1... 

Table 4.2. Abbreviations and half-wave oxidation potentials of various electron donors that form complexes with hetero-TCNQs...

Notes Method A—polymerization in propylene carbonate (PC) at -30°C with 1 = 0.04 tnA/cm method B— polymerization in PC at -30°C with 1 = 0.01 - O.ObmA/cm method C— polymerization in acetonitrile at RT with E=0.85 -1.1 eV method D— polymerization in water with tenside at RT with sweeps between -1 and +1 V method E—in situ photoelectropolymerization in acetonitrile with a series of potentials above the half-wave oxidation potential method F— polymerization in microfiltration membranes in acetonitrile at 1.3 V method G— polymerization at 0.8 V in acetonitrile (in the case of PSS in acetonitrile and water). 

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